Structural and spectral consequences of ion pairing. 4. Theoretical study of alkali metal tetrafluoroborates (M+BF4-; M = lithium, sodium, potassium, and rubidium)

1990 ◽  
Vol 94 (23) ◽  
pp. 8522-8529 ◽  
Author(s):  
Joseph S. Francisco ◽  
Ian H. Williams
Keyword(s):  
Alkali Metal ◽  
Theoretical Study ◽  
Ion Pairing ◽  
Sodium Potassium

Conductance Study of Ion Pairing of Alkali Metal Tetrafluoroborates and Hexafluorophosphates in Acetonitrile

1975 ◽  
Vol 53 (22) ◽  
pp. 3448-3451 ◽  
Author(s):  
H. L. Yeager ◽  
B. Kratochvil
Keyword(s):  
Alkali Metal ◽  
High Precision ◽  
Ion Pairing ◽  
Size Parameter ◽  
Sodium Potassium ◽  
Ion Size ◽  
Best Fit ◽  
Expanded Form

High precision conductance measurements are reported for sodium, potassium, and rubidium tetrafluoroborate and hexafluorophosphate in acetonitrile at 25 °C. The results are analyzed using the expanded form of the Fuoss–Hsia conductance equation. The ion size parameter, d, was systematically varied to obtain the value which gave best fit of the data to the equation. All salts were found to be associated, and the trends in association are discussed in terms of the ability of acetonitrile to solvate cations and anions.

Ion-pairing in aqueous solutions of peroxodisulfates

2012 ◽  
Vol 5 (2) ◽  
pp. 180-185
Author(s):  
Jan Balej
Keyword(s):  
Alkali Metal ◽  
Aqueous Solutions ◽  
Binary Solution ◽  
Ion Association ◽  
Ion Pairing ◽  
Sodium Potassium ◽  
Physico Chemical ◽  
Common Ion ◽  
Chemical Behaviour ◽  
The Common

Abstract Probable values of the degree of ion-pairing (ion-association) of aqueous solutions of alkali metal and ammonium peroxodisulfates have been calculated for various estimated values of association constants, in dependence a) on the concentration of the binary solution, b) on the concentration of the other electrolyte in the polycomponent solution with the common ion, able or not able to form ion pair, and c) on the value of the activity quotient Qa. It followed that in the presence of another component with a common cation and neglecting the influence of activity coefficients, the ion-association degree of peroxodisulfate α > 0.5 in solutions with total molality mt > 0.1 mol kg-1; as mostly Qa < 1.0, the ion-association degree is even higher so that in such cases the alkali metal and ammonium peroxodisulfates can prevailingly behave as uni-univalent electrolytes. In agreement with these results, evaluation of the solubility of sodium, potassium and ammonium peroxodisulfates in some ternary and quaternary systems has been performed under the simplified assumption of a complete ion-association to MS2O81- ions. It has been shown that the mean deviations between the calculated and observed solubilities of the crystallizing components are almost equally low as under the assumption of a total dissociation of the corresponding substances. The results indicated that the prevailing ion-association of more concentrated solutions of peroxodisufates could be taken as an acceptable approach for the quantitative evaluation of physico-chemical behaviour of systems containing peroxodisulfates.

A theoretical study on novel alkaline earth-based excess electron compounds: unique alkalides with considerable nonlinear optical responses

2015 ◽  
Vol 17 (6) ◽  
pp. 4524-4532 ◽  
Author(s):  
Wei-Ming Sun ◽  
Di Wu ◽  
Ying Li ◽  
Jia-Yuan Liu ◽  
Hui-Min He ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Nonlinear Optical ◽  
Alkaline Earth ◽  
Theoretical Study ◽  
Excess Electron ◽  
Optical Responses ◽  
Electron Compounds ◽  
Metal Anions

A series of novel excess electron compounds M(NH3)6NaCl and M(NH3)6Na2 (M = Mg and Ca) were designed, in which the lowest-energy M(NH3)6Na2 compounds are the first alkalides containing double alkali metal anions.

ChemInform Abstract: Experimental and Theoretical Study of the First Thiacalixcrowns (I) and Their Alkali Metal Ion Complexes.

ChemInform ◽  
2010 ◽  
Vol 33 (8) ◽  
pp. no-no
Author(s):  
Veronique Lamare ◽  
Jean-Francois Dozol ◽  
Pierre Thuery ◽  
Martine Nierlich ◽  
Zouhair Asfari ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Metal Ion ◽  
Theoretical Study ◽  
Metal Ion Complexes ◽  
Alkali Metal Ion

THE THEORY OF OPTICAL ABSORPTION IN ALKALI METAL CRYSTALS

1934 ◽  
Vol 10 (3) ◽  
pp. 335-341
Author(s):  
W. H. Watson
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Alkali Metal ◽  
Lattice Constant ◽  
Wave Length ◽  
Ultra Violet ◽  
Periodic Lattice ◽  
Free Electrons ◽  
Sodium Potassium ◽  
Upper Limit

The experimental results of R. W. Wood are compared with theory using the model of free electrons perturbed by the periodic lattice potential. All relevant data are collected in a table in which it is seen that in sodium, potassium, rubidium and caesium the wave-length of the upper limit of the absorption band in the visible and near ultra-violet is proportional to the square of the lattice constant, while lithium occupies an anomalous position. The facts at present available do not permit a completely definite test of the absolute values of these wave-lengths given by the theory.

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